diff --git a/generate-tar b/generate-tar
index 87046da..feebe89 100755
--- a/generate-tar
+++ b/generate-tar
@@ -152,12 +152,12 @@
 
 pflash --partition=part --read=${pnor_dir}/part -F ${pnorfile}
 pflash --partition=VERSION --read=${pnor_dir}/VERSION -F ${pnorfile}
-version_size=$(du -bk ${pnor_dir}/VERSION | head -1 | cut -f 1)
+version_size=$(wc -c ${pnor_dir}/VERSION | cut -d' ' -f 1)
 magic_number=$(xxd -p -l 4 ${pnor_dir}/VERSION)
 # Check if VERSION is signed. A signed version partition will have an extra
 # 4K header starting with the magic number 0x17082011, see:
 # https://github.com/open-power/skiboot/blob/master/libstb/container.h#L47
-if [ "$version_size" == "8" -a "$magic_number" == "17082011" ]; then
+if [ "$version_size" == "8192" -a "$magic_number" == "17082011" ]; then
   # Advance past the STB header (4K, indexed from 1)
   cp ${pnor_dir}/VERSION ${pnor_dir}/VERSION_FULL
   tail --bytes=+4097 ${pnor_dir}/VERSION_FULL > ${pnor_dir}/VERSION